Preparation of K-CuZnZrO2 Series Catalysts and Their Effect on the Performance of CO Hydrogenation for Low-Carbon Alcohol Synthesis
A series of K-CuZnZrO2 catalysts were synthesized using co-precipitation and impregnation methods to investigate the influence of Cu content on the production of lower alcohols,specifically isobutanol,from syngas(CO+H2).Among the products obtained using the K-CuZnZrO2 catalysts,methanol and isobutanol were the pri-mary products(comprising 95％of the total alcohols).The K-12％CuZnZrO2 catalyst with the Cu mass fraction of 12％demonstrated the highest performance for isobutanol synthesis,with an isobutanol selectivity of 20.2％and a yield of 22.8 g/(L-h).Various characterization analyses indicated that altering the Cu component effectively regu-lates the Cu-Zr interaction.Electron transfer between Cu and amorphous ZrO2 significantly promotes the reduction of Cu2+while generating low-strength weak alkaline sites,which favor the formation of more highly dispersed CuO-ZrO2 solid solutions.These solid solutions are critical for the synergistic catalytic synthesis of isobutanol via CO hy-drogenation.An excess of Cu content disrupts the electronic and coordination structure of the CuO-ZrO2 solid solu-tion,weakens the Cu-Zr interaction,inhibits the growth of C-C chains,and ultimately reduces isobutanol selec-tivity.The results provide new perspectives for the design of efficient,highly selective,and stable catalysts for isobutanol synthesis.
CO hydrogenationsynergistic catalysislower alcoholsCuO-ZrO2 solid solution
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